Fortnite crashing at start mac

When i try to start Fortnite alpha on my mac, I get this error and would really like to get some help:
SEGV_MAPERR at 0x7faf30a0ed34

GHAL3D::CGen4LIRControlFlowGraph::MergeConstantBufferLoads(unsigned int, unsigned int, GHAL3D::CGen4ShaderSymbolTable*, S3DDataPortCapabilities const&, iSTD::CStack*, iSTD::CBitSet&, GHAL3D::CGen4LIRInstructionList*, bool, bool) Address = 0x11bd4ba6f (filename not found) [in AppleIntelHD3000GraphicsGLDriver]
GHAL3D::CGen4KernelFunctionList::OptimizeConstantBufferLoads(unsigned int, unsigned int, GHAL3D::CGen4ShaderSymbolTable*, S3DKernelHardwareCapabilities const&, bool, bool) Address = 0x11bd4adfd (filename not found) [in AppleIntelHD3000GraphicsGLDriver]
GHAL3D::CGen4KernelFunctionList::VirtualRegistersToRegisters(GHAL3D::CGen4EURegisterAllocator*, bool, GHAL3D::CGen4ShaderDecomposer*, GHAL3D::CGen4ShaderSymbolTable*, S3DKernelHardwareCapabilities const&, unsigned int, unsigned int, unsigned int, bool&, unsigned int&, unsigned int&, unsigned int&, GHAL3D::SHADER_TYPE) Address = 0x11bef897e (filename not found) [in AppleIntelHD3000GraphicsGLDriver]
GHAL3D::CGen6VertexShaderKernelProgram::Compile(GHAL3D::SKernelCompilerControls const&) Address = 0x11be27677 (filename not found) [in AppleIntelHD3000GraphicsGLDriver]
GHAL3D::CGen6VertexShaderKernelProgram::Build() Address = 0x11be2730b (filename not found) [in AppleIntelHD3000GraphicsGLDriver]
GHAL3D::CGen6VertexShaderKernelProgram::Initialize() Address = 0x11be27295 (filename not found) [in AppleIntelHD3000GraphicsGLDriver]
GHAL3D::CGen6VertexShaderKernelProgram::Create(void const*, PLATFORM_STR, GHAL3D::CVertexShader const*, S3DKernelHardwareCapabilities const&, GHAL3D::CGen6VertexShaderKernelProgram*&) Address = 0x11be271a2 (filename not found) [in AppleIntelHD3000GraphicsGLDriver]
GHAL3D::CGen6VertexShaderKernelProgramCacheData::Initialize() Address = 0x11bfd95d3 (filename not found) [in AppleIntelHD3000GraphicsGLDriver]
GHAL3D::CGen6VertexShaderKernelProgramCacheData::Create(GHAL3D::CStateProcessorCache*, GHAL3D::SGen6VertexShaderKernelProgramCacheKey const&, GHAL3D::CGen6VertexShaderKernelProgramCacheData*&) Address = 0x11bfd950e (filename not found) [in AppleIntelHD3000GraphicsGLDriver]
GHAL3D::CStateCache::PreAllocateData(GHAL3D::SGen6VertexShaderKernelProgramCacheKey const&, GHAL3D::HANDLE_TYPE&) Address = 0x11bfe9ed6 (filename not found) [in AppleIntelHD3000GraphicsGLDriver]
GHAL3D::CGen6StateProcessorCache::CreateVertexShader(GHAL3D::HANDLE_TYPE) Address = 0x11bfe6e69 (filename not found) [in AppleIntelHD3000GraphicsGLDriver]
GHAL3D::CPrivateStateProcessor::CreateVertexShader(GHAL3D::CVertexShader*) Address = 0x11bd1c81b (filename not found) [in AppleIntelHD3000GraphicsGLDriver]
glrUpdateCtxSysVertexProgram Address = 0x11bd1c55f (filename not found) [in AppleIntelHD3000GraphicsGLDriver]
gpusLoadCurrentPipelinePrograms Address = 0x11bfff20b (filename not found) [in AppleIntelHD3000GraphicsGLDriver]
g575_LoadAndOptimizePipelinePrograms(GLDContextRec*, unsigned int*) Address = 0x11c01247f (filename not found) [in AppleIntelHD3000GraphicsGLDriver]
gldUpdateDispatch Address = 0x11bd1b3ce (filename not found) [in AppleIntelHD3000GraphicsGLDriver]
gleDoDrawDispatchCoreGL3 Address = 0x7fff8b161037 (filename not found) [in GLEngine]
glDrawElementsInstancedBaseVertex_STD_GL3Exec Address = 0x7fff8b106205 (filename not found) [in GLEngine]
glDrawElements_UnpackThread Address = 0x7fff8b105a50 (filename not found) [in GLEngine]
gleCmdProcessor Address = 0x7fff8b15ca32 (filename not found) [in GLEngine]
_dispatch_client_callout Address = 0x7fff967dd3c3 (filename not found) [in libdispatch.dylib]
_dispatch_queue_drain Address = 0x7fff967e1ff3 (filename not found) [in libdispatch.dylib]
_dispatch_queue_invoke Address = 0x7fff967e86bf (filename not found) [in libdispatch.dylib]
_dispatch_root_queue_drain Address = 0x7fff967e0d0b (filename not found) [in libdispatch.dylib]
_dispatch_worker_thread3 Address = 0x7fff967e0ab8 (filename not found) [in libdispatch.dylib]
_pthread_wqthread Address = 0x7fff93a2b4f2 (filename not found) [in libsystem_pthread.dylib]
start_wqthread Address = 0x7fff93a29375 (filename not found) [in libsystem_pthread.dylib]

Hello,

Thank you for reporting this crash, although Answerhub is for issues related to Unreal Engine 4 in particular. For support with Fortnite and for reporting these crashes, please go to http://fortnitehelp.epicgames.com/